@Value for properties

spring-cloud-consul-discovery/src/main/java/org/springframework/cloud/consul/discovery/TtlScheduler.java

@@ -5,10 +5,13 @@ import com.ecwid.consul.v1.agent.model.NewService;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.beans.BeansException;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.boot.context.properties.ConfigurationProperties;
 import org.springframework.context.ApplicationContext;
 import org.springframework.context.ApplicationContextAware;
 import org.springframework.scheduling.annotation.Scheduled;
 
+import javax.annotation.PostConstruct;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.atomic.AtomicBoolean;
@@ -17,51 +20,55 @@ import java.util.concurrent.atomic.AtomicBoolean;
  * Created by nicu on 11.03.2015.
  */
 @Slf4j
-public class TtlScheduler implements ApplicationContextAware {
-    private static final int DEFAULT_TTL = 3; // must be > 1
-    public static final int HEARTBEAT_INTERVAL_RATIO = 2 / 3;
+@ConfigurationProperties
+public class TtlScheduler {
 
-    private final Map<String, Long> serviceHeartbeats = new ConcurrentHashMap<>();
-    private final AtomicBoolean heartbeatingNow = new AtomicBoolean();
-    private volatile int ttl;
-    private volatile int heartbeatInterval;
+	private final Map<String, Long> serviceHeartbeats = new ConcurrentHashMap<>();
+	private final AtomicBoolean heartbeatingNow = new AtomicBoolean();
 
-    @Autowired
-    private ConsulClient client;
+    @Value("${consul.ttl:3}")
+	private volatile int ttl;
 
-    @Override
-    public void setApplicationContext(ApplicationContext context) throws BeansException {
-        ttl = context.getEnvironment().getProperty("consul.ttl", Integer.class, DEFAULT_TTL);
-        ttl = Math.min(2, ttl);
-        // heartbeat at 2/3 ttl, but no later than ttl -1s and, (under lesser priority), no sooner than 1s from now
-        heartbeatInterval = Math.max(ttl - 1, Math.min(ttl * HEARTBEAT_INTERVAL_RATIO, 1));
+    @Value("${consul.heartbeatIntervalRatio:0.6}")
+    private volatile int heartbeatIntervalRatio;
+
+	private volatile int heartbeatInterval;
+
+	@Autowired
+	private ConsulClient client;
+
+	@PostConstruct
+    public void computeHeartbeatInterval() {
+        // heartbeat rate at ratio * ttl, but no later than ttl -1s and, (under lesser priority), no sooner than 1s from now
+        heartbeatInterval = Math.max(ttl - 1, Math.min(ttl * heartbeatIntervalRatio, 1));
     }
 
-    /**
-     * Add a service to the checks loop.
-     */
-    public void add(final NewService service) {
-        serviceHeartbeats.put(service.getId(), 0L);
-    }
+	/**
+	 * Add a service to the checks loop.
+	 */
+	public void add(final NewService service) {
+		serviceHeartbeats.put(service.getId(), 0L);
+	}
 
-    public void remove(String serviceId) {
-        serviceHeartbeats.remove(serviceId);
-    }
+	public void remove(String serviceId) {
+		serviceHeartbeats.remove(serviceId);
+	}
 
-    public int getTTL() {
-        return ttl;
-    }
+	public int getTTL() {
+		return ttl;
+	}
 
-    @Scheduled(initialDelay = 0, fixedRate = 100)
-    void heartbeatServices() {
-        if (heartbeatingNow.compareAndSet(false, true)) {
-            for (String serviceId : serviceHeartbeats.keySet()) {
-                long latestHeartbeatDoneForService = serviceHeartbeats.get(serviceId);
-                if(latestHeartbeatDoneForService + heartbeatInterval <= System.currentTimeMillis()) {
-                    client.agentCheckPass(serviceId);
-                    serviceHeartbeats.put(serviceId, System.currentTimeMillis());
-                }
-            }
-        }
-    }
+	@Scheduled(initialDelay = 0, fixedRate = 100)
+	private void heartbeatServices() {
+		if (heartbeatingNow.compareAndSet(false, true)) {
+			for (String serviceId : serviceHeartbeats.keySet()) {
+				long latestHeartbeatDoneForService = serviceHeartbeats.get(serviceId);
+				if (latestHeartbeatDoneForService + heartbeatInterval <= System
+						.currentTimeMillis()) {
+					client.agentCheckPass(serviceId);
+					serviceHeartbeats.put(serviceId, System.currentTimeMillis());
+				}
+			}
+		}
+	}
 }